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Transmission Electron Microscope Study of Anti‐Phase Boundaries in Alexandrite (Al 2− x Cr x BeO 4 )
Author(s) -
Phakey P. P.
Publication year - 1969
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.19690320234
Subject(s) - transmission electron microscopy , diffraction , stacking , chromium , ionic bonding , electron diffraction , crystallography , materials science , phase (matter) , lattice (music) , optics , chemistry , physics , ion , nuclear magnetic resonance , nanotechnology , metallurgy , organic chemistry , acoustics
A study has been made of the diffraction contrast fringe patterns observed by transmission electron microscopy in alexandrite (Al 2— x Cr x BeO 4 ), the chromium bearing variety of chrysoberyl. Evidence is presented that the fringe patterns are due to anti‐phase boundaries resulting from faults in the cation stacking within the same oxygen lattice. Models for the probable ionic configuration of such boundaries are proposed and discussed. It is shown that the diffraction contrast fringe patterns observed with different operating reflections are consistent with those expected from the proposed models.